plate tectonics

2. the upper layer of the earth's mantle below the lithosphere
8. the several large landmasses that make up the world
9. form when plate motions generate magma that erupts on the earths surface
12. a boundary where two plates move together
13. the process by which new oceanic crust forms when magma rises up
14. join together into a single large landmass and then started drifting
15. a ring of volcanos on the edge of tectonic plates
17. the impression of a prehistoric animals in rocks
19. a process by which material is added to tectonic plates or landmass
20. when two tectonic plates move away from each other and make room in the ocean floor is called

1. A rigid layer made up of the uppermost part of the matle crust
3. where two tectonic plates are sliding against each other
4. a sudden and violent shaking of the ground
5. the study of magnetic minerals in rocks
6. the lithosphere is divided into
7. a long undersea mountain chain that has a steep narrow valley at its center
10. crust beneath the ocean
11. the single huge super continent that existed many years ago when all earths continents were joined together
16. what element makes up most of earth's core
18. when one tectonic plate sinks beneath another